Improvement in disintegrating-mills



2 Sheets--Shet 1.

`W DEN M EA D. Disntegrting- Mi`lls.

Patented Jan'. I3, 1874.

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- combination with the disks, as described, of

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WILLIAM Dani/man, or

n'rnn'r GFFICE;

MnLvALn, MARYLAND.

IMPRQVEMENT IN oIsiNrEeRA'lriNe-MILLS.

Specification forming' part of Letters Patent N o. 146,324, dated January 13, 1874; application tiled i November 4, 1873.

To all whom it may concern: Beit known that I, WILLIAM DENMEAD, of Melvale, in the county of Baltimore and State of Maryland, have invented certain Improvements in Disintegrating-Mills, for the grinding of grain, bones, ores, and other material capable of disintegration, of which the following is a specification; and I do hereby declare that in the same is contained a full, clear, and exact description of my said invention, reference being had tothe accompanying drawing and to the letters of reference Inaked thereon. ly

My invention relates to improvements in that class of disintegrating-mills in which the materialis disintegrated by being thrown, by cen.- trifugal force, again st and past a series of pins or beaters secured to disks revolving in opposite directions; and consists, first, in a new construction and arrangement of the disks, each of which shall have, opposin g the other, a surface that shall show, in a diametrical edge scetion of the disk, a zigzag line, each depression of which shall be confronted, and, to some degree, penetrated, by an elevated portion of the zigzag surface of the adjacent disk. The object of this corrugation of the inner surfaces of the disks iste utilize them as disintegratingelements inthe mill, which has not heretofore been done, by giving them operating surfaces, against which the material to be disintegrated, thrown from the center of the disks by centrifugal force, must strike, rebounding from one surface to another. My invention further consists in the combination and arrange'- inent of the disintegrating pins or beaters ordinarily used in this class of mills with, and in reference to, the disks, having inner corrugated surfaces, as described, in such wise as to cause the said pins to stand, as seen in a vertical longitudinal section of the mill, at an angle with the disk-shafts as a horizontal base, each pin of each different annular row extending at a right angle, or forming a T with each opposin g pin ofthe opposite annular row. My invention further consists in a peculiar construction of the disintegrating pins or beaters, and their combination with, and mode of attachment to, the disk. My invention further consists in the opposing annular rows of steel bolt-headspreferably the heads of the bolts which attach the disks proper to their separate hubs-the obj eet of this disposition of bolt-heads being to cause them to act as immediate breakers or Crushers of the material when, by the action of centrifugal force, it is rst thrown from the center of the mill between the disks to their peripheries. y

In the further description of my invention which follows, due reference must `be had to the accompanying drawing, in which-- Figure 1 is a sectional plan view of the mill constructed without disintegrating pins or beaters, theframe being omitted. Fig. 2 shows asimilar view of the mill with the addition of the disintegrating pins or beaters. face view of a portion of a disk and its pins. y Fig. 4 is a front or face view of a disk-hub. Fig. 5 shows the method of securing the pins to the disk.

Similar letters of reference indicate similar parts of the invention in all the views.

A A are the disk-shafts, each being provided with a pulley, B, and arranged in a suity able frame at the bearings a, so as to be capable of being revolved in opposite directions. The hubs C C of thedisks are securely keyed to the shafts, and the disks proper, C, bolted strongly to the hubs. The disks maybe made of cast-steel or iron, and surrounded by wrought bands b, in view ofthe inherent strength necessary in the disks to withstand the violent radial strain to which they are subjected when running at a high rate of speed. The inner faces of the opposing disks show, in Figs. l and 2, the zigzag outline hereinbefore described, the raised portion of one disk confronting, and, in Fig. l, partly entering, the depressedfportion of the other. The steel pins or beaters, which are represented by D, are arranged in concentric annularrows, and secured to the l surfaces of the disks, their ends projecting beyond the limit of the most elevated portions thereof. The pins are made slightly tapering, and driven into the disks from the outer faces, which, as an expedient for lightening the castings, have surfaces similar to the inner. This method of securing the pins, in view of the angle at which they are, placed, tends eifectually to prevent their loosening, as the eifect of the radial strain to which the disks are subjected, and which strain is transmitted, in sonic Fig. 3isa` degree, to the pins,is to seat them more firmly in the disks. E is a feedpipe, (shown, for convenience, in Figs. l and 2, turned over from a perpendicular line,) leading to the casting F, which fits'between the hub (l and the casing G.

The grain or material to be disintegrated enters the center of the machine, from the pipe E,through the opening ein the hub, and is immediately thrown, by centrifugal force, through and past the disintegratiug parts of the mill, consisting, as shown in Fig. 2, of the steel boltheads d, inner corrugated or zigzag surfaces of the disk, and pins or beaters D; or, as seen in Fig. l, the same elements, excepting the pins D, to the casing G, and falls, of its own gravity, to the lowest YYpoint thereof, whence it is conveyed from the mill by suitable means. The principal merits of this machine are to be found in the adapting of the disks themselves to be utilized as elements in the active disintegration of the material; and when the pins are used iu doubling the disintegrating capacity of the machine without increasing the number or weight of parts above those in other mills of its class; as, also, in securing the pins in suchj a manner to the disks that the strain and motion, which usually loosen them in their sockets, tend to seat them more firmly.

Having thus described my invention, what I claim as new, and wish to secure by Letters Patent of the United States, is

" n3. The opposing annular rows of 'steel boit heads d, in combination with disks upon shafts revolving in opposite directions, as set forth.

4. The combination, with the disk or disks, of a tapering disintegrating-pin, or series of the sa1ne,in annular concentric rows, driven from the exterior of the said diskor disks at an angle with the horizontal shafts of the 'machine7 substantially as specified.

WM. DENMEAD.

Vitnesses H. A. DAN'IELs, T. J. LovEGfRovn. 

